and pay attention to where your weight is. You will figure out that it is not ON the object at all but before it or after it. For many objects air is just not needed, just coordination. As you manage these sorts of objects the next steps to getting wheels up in the air will come.
I would learn how to manual and then unweight the rear wheel. This can get you over a lot of obstacles on the trail.
There are many videos that show you how to manual. They key as written above by BMike is where you place your weight. By weighting your front wheel and then throwing your hips back quickly behind your seat you should be able to loft the front wheel. Practice this on grass and then the trail.
After you learn this you can work on un weighting the rear wheel. By placing your weight forward on the bike. When coming up to a log loft the front wheel and then time the unweight of the rear wheel and you should clear it.
Not sure about other peoples trails they race on, but logs are normally over the trails I race.
First, learn how to ride a wheely. You can do this in front of your house in the road. Next, get a few logs and set them up in your drive way or road and practice going over them.
Smaller logs I just bunny hop, bigger logs you can try and bunny hop, just have your weight back and make sure your front wheel gets over, your back tire will impact and force the font down, which is alot faster than just wheeling over and letting your sprockets slam into it. Third option which takes some pretty good skill and works well on the bigger stuff, is a front wheel tap and then jump over.
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